Looks like a Douglas B-18, Boeing B-17 and B-29, and an early Convair B-36.
The maximum takeoff weight of the B-18 Bolo was 27,673 pounds, while a late model B-36J Peacemaker, with its six Wasp Major radials augmented by four GE J47 turbojets, could get off the ground at 410,000 pounds. The bomb load of that B-36J equalled the gross takeoff weight of 3.1 whole B-18s, or a B-17 and a half.
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